[s-cars] Help! Car won't start...

[Tom Green]

Hi Dennis,

I don't think so, but that sounds like something I said before.  : )   
Essential information is missing though;  the characteristics of the  
MIL operation while all this is going on, i.e., comes on when the key  
is turned on, goes off when the engine starts, and doesn't come on  
during engine operation?  Then, any DTCs showing up because of this  
issue?  You would hope to see one if the CPS is the problem.

CPS could do that even if it is just dirty or oil soaked, or a weak  
connection because of corrosion, dirt, etc.  The sensors can be  
affected by ignition noise and result in delayed or no start.  Perhaps  
starting with the condition of plugs and connectors, then coils and  
the connections and fuel pressure regulator then pump after that could  
be a logical course of action.

It never hurts to change the ignition switch.  It gets pretty easy the  
third time or so.  : )

Tom '95 S6
          '95.5 S6 avant
Knoxville, TN

On May 14, 2011, at 1:18 PM, dgraber460 at aol.com wrote:

> Gents;
> On this subject, my 95 S6 exhibited some strange behavior last night.
> Shut it off briefly, and on trying to re-start, it twice cranked and  
> cranked but no spark. I have already replaced the CPS so I didn't  
> think that was it. Knowing the ignition switch is another Achilles  
> heel with these (on its third) I jiggled and wiggled the switch and  
> tried again and it started right up.
> Can the ignition switch cause this or am I looking at another CPS  
> swap?
> Dennis Graber
> 720-838-0558
>
>
> -----Original Message-----
> From: Tom Green <trgreen at comcast.net>
> To: JC <jc at j2c3.com>
> Cc: 's-car list' <s-car-list at audifans.com>
> Sent: Sat, May 14, 2011 8:56 am
> Subject: Re: [s-cars] Help! Car won't start...
>
> Right on. That was my first post to him on the problem; get the ECU to
> communicate.
>
> The ignition switch is not selective in switching on items other  
> than the starter;
> otherwise it powers the bus, and it appears most of the ignition  
> switched items
> receive power. I am not sure about any part of the issue because I  
> am not there;
> many times essential information is omitted. My take on ignition  
> switches is it
> can't hurt, since, if it isn't broke, it will be. I just would not  
> start there without other
> indications of a faulty switch.
>
> Tom
>
> On May 14, 2011, at 8:32 AM, JC wrote:
>
> > I wouldn't be so sure of that Tom - he's missing ignition switched  
> > power at
> > ECU and can't talk to it.
> >
> > Re: Bilhoney's suggestion - lack of Crank Pin is like bad CPS - >  
> something
> > that only comes in once the ECU is alive and operating. If the ECU  
> > isn't
> > live then it won't even have gotten to the point of checking for  
> that.
> >
> > I'd say need to be able to talk to the ECU first before worrying  
> about
> > anything else.
> >
> > Darren - you DID check the all the fuses including ones down there  
> > in the
> > footwell, right? I think somebody posted that right at the  
> beginning > of your
> > troubles..?
> >
> >>
> >> I don't think so. I have not read of any issues posted that
> >> point to a bad ignition switch.
> >
> >>
> >> Tom '95 S6
> >>
> >> On Thursday May 12, 2011, at 10:50 PM, "Darren Smith"
> >> <DS288925 at mycia.net > wrote:
> >>>
> >>> So, we have power at pin 18 on the ecu but not at pin 37. Ground  
> is
> >>> good at pin 24.
> >>>
> >>> Will a new ignition switch help/solve my problem?
> >>>
> >>>
> >>> Signal Description
> >>> 3. Fuel Pump Relay signal (output) (E87) 18. ECU Power
> >> Supply Terminal
> >>> 30 (+12V), Fuse #64 37. Voltage Supply (+12V) input with
> >> ignition on
> >>> for all 5 Fuel injectors (N30-N83), Mass Air Flow Sensor (G70),  
> Evap
> >>>
> >>>
> >
> >
> > __________ Information from ESET NOD32 Antivirus, version of virus  
> > signature
> > database 6120 (20110513) __________
> >
> > The message was checked by ESET NOD32 Antivirus.
> >
> > http://www.eset.com
> >
> >
> >
>
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